Furnace and boiler



G. P. JACK$ON FURNACE AND BOILER Filed Jan. 16, 1925 RFMWSQQ -2 Sheets-Sheet 1 INVENTOR ATTORNEYS y 28, 1929- G. P. JACKSON 1,714,600

FURNACE AND BOILER Filed Jan. 16, 1925 2 Sheets-Sheet 2 Maw A TTORNEYS Patented May 28, 1929.

UNITED stares eATsr QFFEQE.

GEORGE P. JACKSON, OF FLUSHING, NEW YORK, ASSIGNOR TO COMBUSTION ENGI- NEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

summon AND BOILER.

Application filed Jamm 16, 1925. Serial No. 2,748.

This invention relates to furnaces and boilers and is especially useful in connection with boiler furnaces fired by finely divided fuel, such for example as pulverized coal.

One of the objects of the invention is to provide a relatively small boiler of high capacity and to generally cheapen the cost of installations of this character. More specifically in this regard I propose a boiler and boiler furnace arrangement taking up space largely vertically in comparison to the space occupied horizontally.

Another object of the invention has to do with the provision of an improved arrangement of furnace and boiler which can be accommodated in places having definite space limitations, without sacrifice in capacity.

Still another object of the invention has to do with a circulatory system comprised of a plurality of groups of evaporating elements connected for circulation in such a way that a break in one group does not necessarily involve draining the other groups;

I and in which there is local circulation.

Another object of the invention is to protect the upright wall or walls ofthe throat of the furnace or combustion chamber.

The foregoing, together with such other objects as may hereinafter appear, or are incident to my invention, are realized by a construction which I have illustrated in preferred form in the accompanying drawings, wherein Fig. 1 is a vertical elevation thru a boiler and furnace embodying my improvements;

Fig. 2 is a double section taken on the line 22 of Fig. 1, on enlarged scale, and

l ig. 3 is a fragmentary section illustrating modification of the invention.

Referring now to the drawings, it will be seen that A represents a combustion chamher, or furnace, having an outlet throat B at the upper part thereof, and pulverized coal admitting means such as a row of burners C, located to one side of the outlet and adapted to discharge the fuel, preferably with carrying air, in a downward direction into the combustion chamber so that the fuel and flame stream describes a U- shaped course in its movement thru the combustion space. Part of the air is admitted thru the burner castings and the balance of the air for combustion is admitted thru rows of inlets 7' in the front wall, the air de livered therethru being .drawn thru'comlead to the steam space.

partments 8 Within the furnace walls, whereby such air is preheated. The purpose of this will be hereinafter more fully pointed out.

Over the outlet are a plurality of superimposed groups or banks of boiler tubes, diagrammatically indicated as a, b, a. In each general group there are smaller groups 23, 24; 25, 26; 27, 28; respectively. The tubes of the general groups are each connected into headers and the headers in turn are connected together and to the combined water and steam drum 9 so that the groups are in the same general circulation altho having some local circulation.

It will be noted that these groups of tubes are of comparatively short'length, the length of the bottom group of tubes being not materially greater than the horizontal length.

of the throat. The tubes are of shorter length going upwardly. The waste products of combustion leave at the. top of the boiler, any preferred arrangement of stack (not shown) being provided. The horizontal width of the group oftubes and the horizontal Width of the combustion chamber proper and the throat is greater than the horizontal depth or length, as will appear on comparison of Figs. 1 and 2.

The general arrangement of the furnace and groups of boiler sections is thus somewhat in the nature of a stack, slightly wider than deep horizontally. The installation thereof takes up a minimum of floor space. The U-shaped path of the flame provides the needed length of flame travel for combustion.

To obtain high capacity, I provide evaporating elements which are largely subyect to radiant heat. To this end, I arrange a Water screen D in the lower part of the combu stion chamber. This screen is composed of tubes preferably connected intoheaders -9, of which there is preferably one'for each tube. A second screen E is located in front of the bridge wall 10 and is composed of tubes'll, the lower end of eachv of which is connected into a header 9. The upper ends of the tubes 11 connect with the header'12 from which a suitable number. of pipes 13 The front ends of the tubes of the screen D connect into a header'14 and downcomers 15 connect this header with the water space. Oneor more screens F, preferably two, are locatedin the throat B, the tubes thereof connecting into external headers in turn connected to the water space by downcomers l6 and to the.

. steam space by upcomers .17.

- surcd.

Because of their location, these screens perform an extremely large amount of work and the boiler sections a, b, 0, particularly the latter two, become substantially econoniizers. Hence the boiler comprised of these groups may be comparatively small. It will be observed that the connections are such that there is local circulation and hence the boiler groups do not act as a drag on the screens and thus maximum efliciency of "the various evaporating elements is secured.

Furthermore, with the form of connection employed, drainage resulting from a break is reduced to a minimum.

The screens F function also to protect the walls of the throat, and the screen E protects the bridge wall.

The tubes of the screen D are suitably spaced to permit the gravitating refuse partlcles to pass freely through the screen to the floor, the particles remaining in individual form.

Since the evaporating elements tend to lowerfurnace temperature by absorption of heat, I' introduce the major portion of the air for combustion in a preheated state, to which end it is passed through the walls in the manner previously described. Thus maintenance of proper combustion is en- The tubes 15 and 16 may have a common connection 18 with the water space.

In the arrangement of Fig. 3, the header 12 is connected to the header 20 of the boiler group a and the headers21 of the throat screens connect into the header 12. The

tubes 15 lead from the header 22 of group a.

The straight rise of the gases eliminates dead pockets and has other advantages;

I claim: 1. In combination, a boiler furnace hav-' ,ing an outlet threat in an upper part, means for admitting finely divided fuel into the furnace in an upper part in a downward direction to one side of said outlet so that the fuel and flame stream describes a U-shaped course through the furnace, a boiler consisting of three groups of boiler elements, a

of the combustion chamber, a second group having a screen along a wall of the throat, and another group having a bank of short tubes over the throat constituting in effect an economizer section, a steam and water drum, and separate connections between each group of boiler elements and the steam and water'drum,

3. In combination, a boiler furnace having an outlet throat in an upper part, means for admitting finely divided fuel into the furnace in an upper part in a downward direction toone side of said outlet so that the fuel and flame stream describes a U- shaped course through .the furnace, a boiler consisting of three groups of boiler elements, a bottom and sidewall screen forming one group, a threat screen comprising a plurality of rows of substantially upright tubes forming the second group, and a series of banks of short tubes constituting in eifectan econo-- mizer section forming the third group, each group having independentcirculation.

In testimony whereof, I have hereunto signed my name.

. GEORGE P. JACKSON.

CERTIFICATE OF CORRECTION.

Patent No. l, 714, 600.

Granted May 28, 1929. to

GEORGE P. JACKSON.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Page 2, line 59, claim 1, for the word "and" first occurrence read "of"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office Signed and sealed this 2nd day of July, A. D. 1929.

(Seal) M. J. Moore, 7 Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,714,600. Granted May 28, 1929, to

GEORGE P. JACKSCN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 59, claim 1, for the word "and" first occurrence read "of"; and that the-said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 2nd day of July, A. D. 1929.

M, J. Moore,

(Seal) Acting Commissioner of Patents. 

